Doug Smith W9WI had written:

| My understanding is that WBZ's DA actually protects the *east* - they're
| trying to avoid wasting power over the ocean where there's nobody (at
| least nobody with a diary) listening. The Wyoming station (KTWO Casper)
| protects WBZ, but not vice-versa.

As others here have said, that is correct. A visit to the site in
Hull makes it clear that there was some pretty shrewd engineering
behind that move.

As a data point, in Chicago, the very minute WNVR/1030 goes off
the air at sunset, WBZ comes booming in. I think WNVR may have a
license that allows it to sign on at Boston local sunrise rather
than Chicago, but I don't remember for sure now.

Farther to the south, though, in Missouri, WBZ isn't much of a
catch for nighttime listening while, sometimes, thanks to the time
difference, KTWO can be heard in the early evening hours. In the
Kansas City area, 1030 was also horked up by the station in Blue
Springs which has practically no nighttime signal north of the
Missouri River...one of the two areas in KC with the fastest
population growth. (But who listens to AM at night?)

--
Mark Roberts
Oakland, California
(it will forward)